Revert "Revert r211402 (and r211408,r211410), "CodeGen: Refactor dynamic_cast and typeid" It crashes msvc codegen in clang/test/SemaCXX/undefined-internal.cpp."
This reverts commit r211467 which reverted r211408,r211410, it caused
crashes in test/SemaCXX/undefined-internal.cpp for i686-win32 targets.
llvm-svn: 211473
diff --git a/clang/test/CodeGenCXX/microsoft-abi-dynamic-cast.cpp b/clang/test/CodeGenCXX/microsoft-abi-dynamic-cast.cpp
index 3084d0e..2fc4a62 100644
--- a/clang/test/CodeGenCXX/microsoft-abi-dynamic-cast.cpp
+++ b/clang/test/CodeGenCXX/microsoft-abi-dynamic-cast.cpp
@@ -1,158 +1,130 @@
-// RUN: %clang_cc1 -emit-llvm -O2 -optzns -o - -triple=i386-pc-win32 2>/dev/null %s | FileCheck %s
-// REQUIRES: asserts
+// RUN: %clang_cc1 -emit-llvm -O1 -o - -triple=i386-pc-win32 %s | FileCheck %s
struct S { char a; };
-struct V { virtual void f(){} };
+struct V { virtual void f(); };
struct A : virtual V {};
struct B : S, virtual V {};
struct T {};
T* test0() { return dynamic_cast<T*>((B*)0); }
-// CHECK: define noalias %struct.T* @"\01?test0@@YAPAUT@@XZ"() #0 {
-// CHECK-NEXT: entry:
-// CHECK-NEXT: ret %struct.T* null
-// CHECK-NEXT: }
+// CHECK-LABEL: define noalias %struct.T* @"\01?test0@@YAPAUT@@XZ"()
+// CHECK: ret %struct.T* null
T* test1(V* x) { return &dynamic_cast<T&>(*x); }
-// CHECK: define %struct.T* @"\01?test1@@YAPAUT@@PAUV@@@Z"(%struct.V* %x) #1 {
-// CHECK-NEXT: entry:
-// CHECK-NEXT: %0 = bitcast %struct.V* %x to i8*
-// CHECK-NEXT: %1 = tail call i8* @__RTDynamicCast(i8* %0, i32 0, i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUV@@@8" to i8*), i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUT@@@8" to i8*), i32 1) #2
-// CHECK-NEXT: %2 = bitcast i8* %1 to %struct.T*
-// CHECK-NEXT: ret %struct.T* %2
-// CHECK-NEXT: }
+// CHECK-LABEL: define %struct.T* @"\01?test1@@YAPAUT@@PAUV@@@Z"(%struct.V* %x)
+// CHECK: [[CAST:%.*]] = bitcast %struct.V* %x to i8*
+// CHECK-NEXT: [[CALL:%.*]] = tail call i8* @__RTDynamicCast(i8* [[CAST]], i32 0, i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUV@@@8" to i8*), i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUT@@@8" to i8*), i32 1)
+// CHECK-NEXT: [[RET:%.*]] = bitcast i8* [[CALL]] to %struct.T*
+// CHECK-NEXT: ret %struct.T* [[RET]]
T* test2(A* x) { return &dynamic_cast<T&>(*x); }
-// CHECK: define %struct.T* @"\01?test2@@YAPAUT@@PAUA@@@Z"(%struct.A* %x) #1 {
-// CHECK-NEXT: entry:
-// CHECK-NEXT: %0 = bitcast %struct.A* %x to i8*
-// CHECK-NEXT: %1 = bitcast %struct.A* %x to i8**
-// CHECK-NEXT: %vbtable = load i8** %1, align 4
-// CHECK-NEXT: %2 = getelementptr inbounds i8* %vbtable, i32 4
-// CHECK-NEXT: %3 = bitcast i8* %2 to i32*
-// CHECK-NEXT: %vbase_offs = load i32* %3, align 4
-// CHECK-NEXT: %4 = getelementptr inbounds i8* %0, i32 %vbase_offs
-// CHECK-NEXT: %5 = tail call i8* @__RTDynamicCast(i8* %4, i32 %vbase_offs, i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUA@@@8" to i8*), i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUT@@@8" to i8*), i32 1) #2
-// CHECK-NEXT: %6 = bitcast i8* %5 to %struct.T*
-// CHECK-NEXT: ret %struct.T* %6
-// CHECK-NEXT: }
+// CHECK-LABEL: define %struct.T* @"\01?test2@@YAPAUT@@PAUA@@@Z"(%struct.A* %x)
+// CHECK: [[CAST:%.*]] = bitcast %struct.A* %x to i8*
+// CHECK-NEXT: [[BITCAST:%.*]] = bitcast %struct.A* %x to i8**
+// CHECK-NEXT: [[VBTBL:%.*]] = load i8** [[BITCAST]], align 4
+// CHECK-NEXT: [[VBOFFP:%.*]] = getelementptr inbounds i8* [[VBTBL]], i32 4
+// CHECK-NEXT: [[VBOFFPCAST:%.*]] = bitcast i8* [[VBOFFP]] to i32*
+// CHECK-NEXT: [[VBOFFS:%.*]] = load i32* [[VBOFFPCAST]], align 4
+// CHECK-NEXT: [[ADJ:%.*]] = getelementptr inbounds i8* [[CAST]], i32 [[VBOFFS]]
+// CHECK-NEXT: [[CALL:%.*]] = tail call i8* @__RTDynamicCast(i8* [[ADJ]], i32 [[VBOFFS]], i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUA@@@8" to i8*), i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUT@@@8" to i8*), i32 1)
+// CHECK-NEXT: [[RET:%.*]] = bitcast i8* [[CALL]] to %struct.T*
+// CHECK-NEXT: ret %struct.T* [[RET]]
T* test3(B* x) { return &dynamic_cast<T&>(*x); }
-// CHECK: define %struct.T* @"\01?test3@@YAPAUT@@PAUB@@@Z"(%struct.B* %x) #1 {
-// CHECK-NEXT: entry:
-// CHECK-NEXT: %0 = getelementptr inbounds %struct.B* %x, i32 0, i32 0, i32 0
-// CHECK-NEXT: %vbptr = getelementptr inbounds i8* %0, i32 4
-// CHECK-NEXT: %1 = bitcast i8* %vbptr to i8**
-// CHECK-NEXT: %vbtable = load i8** %1, align 4
-// CHECK-NEXT: %2 = getelementptr inbounds i8* %vbtable, i32 4
-// CHECK-NEXT: %3 = bitcast i8* %2 to i32*
-// CHECK-NEXT: %vbase_offs = load i32* %3, align 4
-// CHECK-NEXT: %4 = add nsw i32 %vbase_offs, 4
-// CHECK-NEXT: %5 = getelementptr inbounds i8* %0, i32 %4
-// CHECK-NEXT: %6 = tail call i8* @__RTDynamicCast(i8* %5, i32 %4, i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUB@@@8" to i8*), i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUT@@@8" to i8*), i32 1) #2
-// CHECK-NEXT: %7 = bitcast i8* %6 to %struct.T*
-// CHECK-NEXT: ret %struct.T* %7
-// CHECK-NEXT: }
+// CHECK-LABEL: define %struct.T* @"\01?test3@@YAPAUT@@PAUB@@@Z"(%struct.B* %x)
+// CHECK: [[VOIDP:%.*]] = getelementptr inbounds %struct.B* %x, i32 0, i32 0, i32 0
+// CHECK-NEXT: [[VBPTR:%.*]] = getelementptr inbounds i8* [[VOIDP]], i32 4
+// CHECK-NEXT: [[BITCAST:%.*]] = bitcast i8* [[VBPTR:%.*]] to i8**
+// CHECK-NEXT: [[VBTBL:%.*]] = load i8** [[BITCAST]], align 4
+// CHECK-NEXT: [[VBOFFP:%.*]] = getelementptr inbounds i8* [[VBTBL]], i32 4
+// CHECK-NEXT: [[VBOFFPCAST:%.*]] = bitcast i8* [[VBOFFP]] to i32*
+// CHECK-NEXT: [[VBOFFS:%.*]] = load i32* [[VBOFFPCAST]], align 4
+// CHECK-NEXT: [[DELTA:%.*]] = add nsw i32 [[VBOFFS]], 4
+// CHECK-NEXT: [[ADJ:%.*]] = getelementptr inbounds i8* [[VOIDP]], i32 [[DELTA]]
+// CHECK-NEXT: [[CALL:%.*]] = tail call i8* @__RTDynamicCast(i8* [[ADJ]], i32 [[DELTA]], i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUB@@@8" to i8*), i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUT@@@8" to i8*), i32 1)
+// CHECK-NEXT: [[RET:%.*]] = bitcast i8* [[CALL]] to %struct.T*
+// CHECK-NEXT: ret %struct.T* [[RET]]
T* test4(V* x) { return dynamic_cast<T*>(x); }
-// CHECK: define %struct.T* @"\01?test4@@YAPAUT@@PAUV@@@Z"(%struct.V* %x) #1 {
-// CHECK-NEXT: entry:
-// CHECK-NEXT: %0 = bitcast %struct.V* %x to i8*
-// CHECK-NEXT: %1 = tail call i8* @__RTDynamicCast(i8* %0, i32 0, i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUV@@@8" to i8*), i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUT@@@8" to i8*), i32 0) #2
-// CHECK-NEXT: %2 = bitcast i8* %1 to %struct.T*
-// CHECK-NEXT: ret %struct.T* %2
-// CHECK-NEXT: }
+// CHECK-LABEL: define %struct.T* @"\01?test4@@YAPAUT@@PAUV@@@Z"(%struct.V* %x)
+// CHECK: [[CAST:%.*]] = bitcast %struct.V* %x to i8*
+// CHECK-NEXT: [[CALL:%.*]] = tail call i8* @__RTDynamicCast(i8* [[CAST]], i32 0, i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUV@@@8" to i8*), i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUT@@@8" to i8*), i32 0)
+// CHECK-NEXT: [[RET:%.*]] = bitcast i8* [[CALL]] to %struct.T*
+// CHECK-NEXT: ret %struct.T* [[RET]]
T* test5(A* x) { return dynamic_cast<T*>(x); }
-// CHECK: define %struct.T* @"\01?test5@@YAPAUT@@PAUA@@@Z"(%struct.A* %x) #1 {
-// CHECK-NEXT: entry:
-// CHECK-NEXT: %0 = icmp eq %struct.A* %x, null
-// CHECK-NEXT: br i1 %0, label %dynamic_cast.call, label %dynamic_cast.valid
-// CHECK: dynamic_cast.valid: ; preds = %entry
-// CHECK-NEXT: %1 = bitcast %struct.A* %x to i8*
-// CHECK-NEXT: %2 = bitcast %struct.A* %x to i8**
-// CHECK-NEXT: %vbtable = load i8** %2, align 4
-// CHECK-NEXT: %3 = getelementptr inbounds i8* %vbtable, i32 4
-// CHECK-NEXT: %4 = bitcast i8* %3 to i32*
-// CHECK-NEXT: %vbase_offs = load i32* %4, align 4
-// CHECK-NEXT: %5 = getelementptr inbounds i8* %1, i32 %vbase_offs
-// CHECK-NEXT: %6 = tail call i8* @__RTDynamicCast(i8* %5, i32 %vbase_offs, i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUA@@@8" to i8*), i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUT@@@8" to i8*), i32 0) #2
-// CHECK-NEXT: %phitmp = bitcast i8* %6 to %struct.T*
-// CHECK-NEXT: br label %dynamic_cast.call
-// CHECK: dynamic_cast.call: ; preds = %dynamic_cast.valid, %entry
-// CHECK-NEXT: %7 = phi %struct.T* [ %phitmp, %dynamic_cast.valid ], [ null, %entry ]
-// CHECK-NEXT: ret %struct.T* %7
-// CHECK-NEXT: }
+// CHECK-LABEL: define %struct.T* @"\01?test5@@YAPAUT@@PAUA@@@Z"(%struct.A* %x)
+// CHECK: [[CHECK:%.*]] = icmp eq %struct.A* %x, null
+// CHECK-NEXT: br i1 [[CHECK]]
+// CHECK: [[VOIDP:%.*]] = bitcast %struct.A* %x to i8*
+// CHECK-NEXT: [[BITCAST:%.*]] = bitcast %struct.A* %x to i8**
+// CHECK-NEXT: [[VBTBL:%.*]] = load i8** [[BITCAST]], align 4
+// CHECK-NEXT: [[VBOFFP:%.*]] = getelementptr inbounds i8* [[VBTBL]], i32 4
+// CHECK-NEXT: [[VBOFFPCAST:%.*]] = bitcast i8* [[VBOFFP]] to i32*
+// CHECK-NEXT: [[VBOFFS:%.*]] = load i32* [[VBOFFPCAST:%.*]], align 4
+// CHECK-NEXT: [[ADJ:%.*]] = getelementptr inbounds i8* [[VOIDP]], i32 [[VBOFFS]]
+// CHECK-NEXT: [[CALL:%.*]] = tail call i8* @__RTDynamicCast(i8* [[ADJ]], i32 [[VBOFFS]], i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUA@@@8" to i8*), i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUT@@@8" to i8*), i32 0)
+// CHECK-NEXT: [[RES:%.*]] = bitcast i8* [[CALL]] to %struct.T*
+// CHECK-NEXT: br label
+// CHECK: [[RET:%.*]] = phi %struct.T*
+// CHECK-NEXT: ret %struct.T* [[RET]]
T* test6(B* x) { return dynamic_cast<T*>(x); }
-// CHECK: define %struct.T* @"\01?test6@@YAPAUT@@PAUB@@@Z"(%struct.B* %x) #1 {
-// CHECK-NEXT: entry:
-// CHECK-NEXT: %0 = icmp eq %struct.B* %x, null
-// CHECK-NEXT: br i1 %0, label %dynamic_cast.call, label %dynamic_cast.valid
-// CHECK: dynamic_cast.valid: ; preds = %entry
-// CHECK-NEXT: %1 = getelementptr inbounds %struct.B* %x, i32 0, i32 0, i32 0
-// CHECK-NEXT: %vbptr = getelementptr inbounds i8* %1, i32 4
-// CHECK-NEXT: %2 = bitcast i8* %vbptr to i8**
-// CHECK-NEXT: %vbtable = load i8** %2, align 4
-// CHECK-NEXT: %3 = getelementptr inbounds i8* %vbtable, i32 4
-// CHECK-NEXT: %4 = bitcast i8* %3 to i32*
-// CHECK-NEXT: %vbase_offs = load i32* %4, align 4
-// CHECK-NEXT: %5 = add nsw i32 %vbase_offs, 4
-// CHECK-NEXT: %6 = getelementptr inbounds i8* %1, i32 %5
-// CHECK-NEXT: %7 = tail call i8* @__RTDynamicCast(i8* %6, i32 %5, i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUB@@@8" to i8*), i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUT@@@8" to i8*), i32 0) #2
-// CHECK-NEXT: %phitmp = bitcast i8* %7 to %struct.T*
-// CHECK-NEXT: br label %dynamic_cast.call
-// CHECK: dynamic_cast.call: ; preds = %dynamic_cast.valid, %entry
-// CHECK-NEXT: %8 = phi %struct.T* [ %phitmp, %dynamic_cast.valid ], [ null, %entry ]
-// CHECK-NEXT: ret %struct.T* %8
-// CHECK-NEXT: }
+// CHECK-LABEL: define %struct.T* @"\01?test6@@YAPAUT@@PAUB@@@Z"(%struct.B* %x)
+// CHECK: [[CHECK:%.*]] = icmp eq %struct.B* %x, null
+// CHECK-NEXT: br i1 [[CHECK]]
+// CHECK: [[CAST:%.*]] = getelementptr inbounds %struct.B* %x, i32 0, i32 0, i32 0
+// CHECK-NEXT: [[VBPTR:%.*]] = getelementptr inbounds i8* [[CAST]], i32 4
+// CHECK-NEXT: [[BITCAST:%.*]] = bitcast i8* [[VBPTR]] to i8**
+// CHECK-NEXT: [[VBTBL:%.*]] = load i8** [[BITCAST]], align 4
+// CHECK-NEXT: [[VBOFFP:%.*]] = getelementptr inbounds i8* [[VBTBL]], i32 4
+// CHECK-NEXT: [[VBOFFPCAST:%.*]] = bitcast i8* [[VBOFFP]] to i32*
+// CHECK-NEXT: [[VBOFFS:%.*]] = load i32* [[VBOFFPCAST:%.*]], align 4
+// CHECK-NEXT: [[DELTA:%.*]] = add nsw i32 [[VBOFFS]], 4
+// CHECK-NEXT: [[ADJ:%.*]] = getelementptr inbounds i8* [[CAST]], i32 [[DELTA]]
+// CHECK-NEXT: [[CALL:%.*]] = tail call i8* @__RTDynamicCast(i8* [[ADJ]], i32 [[DELTA]], i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUB@@@8" to i8*), i8* bitcast (%"MSRTTITypeDescriptor\07"* @"\01??_R0?AUT@@@8" to i8*), i32 0)
+// CHECK-NEXT: [[RES:%.*]] = bitcast i8* [[CALL]] to %struct.T*
+// CHECK-NEXT: br label
+// CHECK: [[RET:%.*]] = phi %struct.T*
+// CHECK-NEXT: ret %struct.T* [[RET]]
void* test7(V* x) { return dynamic_cast<void*>(x); }
-// CHECK: define i8* @"\01?test7@@YAPAXPAUV@@@Z"(%struct.V* %x) #1 {
-// CHECK-NEXT: entry:
-// CHECK-NEXT: %0 = bitcast %struct.V* %x to i8*
-// CHECK-NEXT: %1 = tail call i8* @__RTCastToVoid(i8* %0) #2
-// CHECK-NEXT: ret i8* %1
-// CHECK-NEXT: }
+// CHECK-LABEL: define i8* @"\01?test7@@YAPAXPAUV@@@Z"(%struct.V* %x)
+// CHECK: [[CAST:%.*]] = bitcast %struct.V* %x to i8*
+// CHECK-NEXT: [[RET:%.*]] = tail call i8* @__RTCastToVoid(i8* [[CAST]])
+// CHECK-NEXT: ret i8* [[RET]]
void* test8(A* x) { return dynamic_cast<void*>(x); }
-// CHECK: define i8* @"\01?test8@@YAPAXPAUA@@@Z"(%struct.A* %x) #1 {
-// CHECK-NEXT: entry:
-// CHECK-NEXT: %0 = icmp eq %struct.A* %x, null
-// CHECK-NEXT: br i1 %0, label %dynamic_cast.call, label %dynamic_cast.valid
-// CHECK: dynamic_cast.valid: ; preds = %entry
-// CHECK-NEXT: %1 = bitcast %struct.A* %x to i8*
-// CHECK-NEXT: %2 = bitcast %struct.A* %x to i8**
-// CHECK-NEXT: %vbtable = load i8** %2, align 4
-// CHECK-NEXT: %3 = getelementptr inbounds i8* %vbtable, i32 4
-// CHECK-NEXT: %4 = bitcast i8* %3 to i32*
-// CHECK-NEXT: %vbase_offs = load i32* %4, align 4
-// CHECK-NEXT: %5 = getelementptr inbounds i8* %1, i32 %vbase_offs
-// CHECK-NEXT: %6 = tail call i8* @__RTCastToVoid(i8* %5) #2
-// CHECK-NEXT: br label %dynamic_cast.call
-// CHECK: dynamic_cast.call: ; preds = %dynamic_cast.valid, %entry
-// CHECK-NEXT: %7 = phi i8* [ %6, %dynamic_cast.valid ], [ null, %entry ]
-// CHECK-NEXT: ret i8* %7
-// CHECK-NEXT: }
+// CHECK-LABEL: define i8* @"\01?test8@@YAPAXPAUA@@@Z"(%struct.A* %x)
+// CHECK: [[CHECK:%.*]] = icmp eq %struct.A* %x, null
+// CHECK-NEXT: br i1 [[CHECK]]
+// CHECK: [[VOIDP:%.*]] = bitcast %struct.A* %x to i8*
+// CHECK-NEXT: [[BITCAST:%.*]] = bitcast %struct.A* %x to i8**
+// CHECK-NEXT: [[VBTBL:%.*]] = load i8** [[BITCAST]], align 4
+// CHECK-NEXT: [[VBOFFP:%.*]] = getelementptr inbounds i8* [[VBTBL]], i32 4
+// CHECK-NEXT: [[VBOFFPCAST:%.*]] = bitcast i8* [[VBOFFP]] to i32*
+// CHECK-NEXT: [[VBOFFS:%.*]] = load i32* [[VBOFFPCAST:%.*]], align 4
+// CHECK-NEXT: [[ADJ:%.*]] = getelementptr inbounds i8* [[VOIDP]], i32 [[VBOFFS]]
+// CHECK-NEXT: [[RES:%.*]] = tail call i8* @__RTCastToVoid(i8* [[ADJ]])
+// CHECK-NEXT: br label
+// CHECK: [[RET:%.*]] = phi i8*
+// CHECK-NEXT: ret i8* [[RET]]
void* test9(B* x) { return dynamic_cast<void*>(x); }
-// CHECK: define i8* @"\01?test9@@YAPAXPAUB@@@Z"(%struct.B* %x) #1 {
-// CHECK-NEXT: entry:
-// CHECK-NEXT: %0 = icmp eq %struct.B* %x, null
-// CHECK-NEXT: br i1 %0, label %dynamic_cast.call, label %dynamic_cast.valid
-// CHECK: dynamic_cast.valid: ; preds = %entry
-// CHECK-NEXT: %1 = getelementptr inbounds %struct.B* %x, i32 0, i32 0, i32 0
-// CHECK-NEXT: %vbptr = getelementptr inbounds i8* %1, i32 4
-// CHECK-NEXT: %2 = bitcast i8* %vbptr to i8**
-// CHECK-NEXT: %vbtable = load i8** %2, align 4
-// CHECK-NEXT: %3 = getelementptr inbounds i8* %vbtable, i32 4
-// CHECK-NEXT: %4 = bitcast i8* %3 to i32*
-// CHECK-NEXT: %vbase_offs = load i32* %4, align 4
-// CHECK-NEXT: %5 = add nsw i32 %vbase_offs, 4
-// CHECK-NEXT: %6 = getelementptr inbounds i8* %1, i32 %5
-// CHECK-NEXT: %7 = tail call i8* @__RTCastToVoid(i8* %6) #2
-// CHECK-NEXT: br label %dynamic_cast.call
-// CHECK: dynamic_cast.call: ; preds = %dynamic_cast.valid, %entry
-// CHECK-NEXT: %8 = phi i8* [ %7, %dynamic_cast.valid ], [ null, %entry ]
-// CHECK-NEXT: ret i8* %8
-// CHECK-NEXT: }
+// CHECK-LABEL: define i8* @"\01?test9@@YAPAXPAUB@@@Z"(%struct.B* %x)
+// CHECK: [[CHECK:%.*]] = icmp eq %struct.B* %x, null
+// CHECK-NEXT: br i1 [[CHECK]]
+// CHECK: [[CAST:%.*]] = getelementptr inbounds %struct.B* %x, i32 0, i32 0, i32 0
+// CHECK-NEXT: [[VBPTR:%.*]] = getelementptr inbounds i8* [[CAST]], i32 4
+// CHECK-NEXT: [[BITCAST:%.*]] = bitcast i8* [[VBPTR]] to i8**
+// CHECK-NEXT: [[VBTBL:%.*]] = load i8** [[BITCAST]], align 4
+// CHECK-NEXT: [[VBOFFP:%.*]] = getelementptr inbounds i8* [[VBTBL]], i32 4
+// CHECK-NEXT: [[VBOFFPCAST:%.*]] = bitcast i8* [[VBOFFP]] to i32*
+// CHECK-NEXT: [[VBOFFS:%.*]] = load i32* [[VBOFFPCAST:%.*]], align 4
+// CHECK-NEXT: [[DELTA:%.*]] = add nsw i32 [[VBOFFS]], 4
+// CHECK-NEXT: [[ADJ:%.*]] = getelementptr inbounds i8* [[CAST]], i32 [[DELTA]]
+// CHECK-NEXT: [[CALL:%.*]] = tail call i8* @__RTCastToVoid(i8* [[ADJ]])
+// CHECK-NEXT: br label
+// CHECK: [[RET:%.*]] = phi i8*
+// CHECK-NEXT: ret i8* [[RET]]
+